I'm making a set right now as a prototype for a customer.... well as soon as it gets below 110 in the shop I will be :wink:, I'm using the click sierra pen and the click sierra pencil from exotics.
The only thing I noticed is that the button click pen is longer then the pencil, this is because you can use a uniball refill or a parker refill (with spacer/adapter) in the pen, but I did some measuring, and I'm going to shorten the tube .600" and just have it use the parker refill and don't give the option for the uniball.
This way both the pen and pencil will be about the same length when finished.
The pencil seems to be very sturdy.
I'll post pictures as soon as I can get back out in the shop, and finish the set.